Actuator for cover of a vehicle body opening

The closure mechanism of the operating device (12) has a locking pin (16) in active connection with the flap cover (14) and mounted to rotate bayonet lock like about the longitudinal axis (18) of the flap cover to close and secure same. The locking pin interacts with a locking device (20) The locking pin has on its side remote from the cover a guide bore (30) for receiving the guide pin (28) which can be provided on the housing cover (26) of a housing bush.